Lightly spoon the flour into a dry measuring cup, and level with a knife. Place flour, thyme, salt, and pepper in medium bowl; gradually add milk and broth, stirring with a whisk until well-blended. Melt the butter in a medium saucepan over medium-high heat. Add the onion; saute 4 minutes. Add milk mixture; cook until thick (about 4 minutes), stirring constantly. Remove from heat, and stir in juice. Combine the pasta mixture, milk mixture, ham, and parsley in large bowl; spoon into a 2-quart casserole. Sprinkle with breadcrumbs and cheese.

Bake at 450° for 10 minutes or until filling is bubbly and topping is golden.

*Could be made ahead and frozen. Thaw in refrigerator then bake until bubbly and topping is golden.